Metal spool



Sept. 29,-1931. r.- G. BAXENDEN ET AL 1,825,044

Patented Sept. 29, 1931 UNITED AIENT oF1 Applicationfild ugusfi2} 199,Sefiail 1og382,999, axid in 'dreat Britem August 10, 1928.

This invention relates tometalliospools,

for camera film rolls andthe like,' and partiCularly tothe manufactureof the spmdles therefor. v 6 The object of the invention is tofacfi1tatethe production of suit-abl metallic spmdles which Will be of low weight,cheap to menu-fi strong for the pur-* strip of material to be used anda, perfectly facture, and sufiiciently A poses to which theyare to beput.

10 The class of spindle to which the invention relates is that in whichaspindle-is orm d* from a fiat substantially rectangular 1-st11p whichis bent or rolled upinto a hollow cylifl* der with opposite edges of thestrip lying adjacent to one another, the diameter of;the cylinder 'beinggoverned by the original width of the strip. Opposite edges'of the stripare turned in to form aguiding passage -will be appreciated when thefilm roll is beng wourid onthe spi ndle in a drk froom. A manufacturhigon eachside of the internal longitudinal slot left between the adjacent,Opposite edges.*

The term internal ishere:used toindicate that the slot does not extefidup to eithe1of-n: According to the.

rolled up to form One arrangement 'according to the inventhe ends of thespindle. 7 present invention, theinturned edgesextend *axielly beyondthe ends of the internal slOt,:

though not up to the very ehdS of.th Spindle. In a process for making.such: a. ntallic spindle, according to the present invention,

, the four corners of a rectangular' strip are removed, as by punchingand opposite longitudinal edges of the strip between the removed cornersare bent ofiz about parallel inset limes which do not xtend as far asthe removed corners to form, with the main fiat fiat portion of thestrip is then bent or rolled up to form a holl0W oylinder with theopposite or bent-0E edges extending into the interior thereof. Byarranging for the beIit-. ofiz edges to be bent about parallel limeswhich are inset slightly from the edges of the fiat portion ofthe stripan 1nternal slot will be left in the spindle between the bent-off edges.The hollow cylinder thus formed is then set L: part of the strip, a.shallow channel; and the lefttfieribetveeh wlienthe spiridle is formed,"

maybe so chosen that the appropriate adja: cent end ofthe bent-off edgescan form a bOttom rst forthe cmera key"when it* nters gthe cooperatingslot in the appropriate end' 5532 disc of th spindle.

l lle bent-ofi edges act to Strengthen thesp1r1dlegthus allowing 'averythin metallic rigid spindle (for the use to Which it is in tendedtobe subjectd)"to be forrned. A satisfactory spindle ner the weight oweight of a similar-sized spindleforrned of' w0od. The round slot, due{to the material being bent thereat,

provide a 'useful paper or like roll, t

is-that the bent-off ing off of the edges ofthe A guide for the 'end ofthe he full advantagdoiwhich when the fiat portion of the strip is bentor tion will now be thehollow'cylinder. -7

fully gdescribed with refr e1ence to the accompanying draWings,-the fourfiguresbf which iridicate four steps the manufacture of'a spindleaccording tov. 1 Figur 1"-is an illuslfirati0n of the shap o f:

the invention. f

the fiat strip from which th e spindle ismade;

Figure 2 'illusti*atsthe neXt stageofmanufacture in which turnd upFigure 3 illustrates the strip rolled into the edges ofthe strip arewidth equal'tdthe Figuref4 illstrtes} tlie complted spindle A 'longstrip ofsuitble; material, of a lengthlof the spindlehen firiished,is edinto a press adapted to divide the long strip up into a numberoftrarsverse stripS such as "that markd 5 in Fig: 1. "At' the saltime-th press punches: out a long i tudiril slot 6 in the centre of eachstrip5,z and it also removes the material at'the f0ur corners, leavingthe blanks 7, 7 and the extending edges 8, 8' therebetween.

'These strips 5 are machine, which 1) then passed into anothi: ends ofithe edges 8,. '8 at right-angles to the main body of the strip forming ashallow channel-shaped member (Fig. 2). Due to the removal of thecorners of the strip the bent-ofi' edges do not extend to the endsof thestrip, and only the interior portion of thestrip (as regards its length)is a hollowchannel. 7 'Obviouslythe two operations thusofar deseribedmay in pratice be efiected in a single automatic machine ihstead ofintwo separate machines. 7 The chain limes 9 (Fig. 1) represent theedges proper of the fiat portion of the stfir), but the bent-ofi'edges8,8 are bentsligbtly about the lines 9 but mainly about the chinfines 10, 10 which are inset. slightly with ,re:

spet to tlie'lines 9, 9 and,do not extend. axially as far as the blanks7,- Z.: When this has v been done the bent-ofi' edges (Fig. 2) are 0nset slightly, ovei the mainportion of their length, with respect to theedges:o;fthe-flat;

part of the strip marked 11, 11.

In the next opemtion the fiat part ofthe: strip is bent or rolledup, inone or-mo1e- JS&PS,.'tO forma hollow cylihder. thi s operation, theopposite edges 11., 11: are.

brought into contact, but, on release fromthe rolling machine, thenatural: resiliency of the material causes the opposite edges of thespihdle to spring'out slightly, as indicated by Fig. 3 where the edges11,11 are see1i not to.,be in contact. A longitudinal intrnal slot 12 isformedbetween the bent-Ofi edges 8 85 v In the final the oppositeedgesll,- 11 into. contact, and the slot.12 between thebent-lofi edges8, 8 is then truiy an internalslot, whieh does not extend-up to the endsof thQ-spindle.

The enddiscs (not shown) of the spoolmay besecured at the ends of the'spindleby a pressing operatioh or by Welding. :The pres-' ont inventionis not eoncerned with'the man ner in which the end spindle;

It should bei10ted th2ittlie bent ofi edge's 8,

. be wound upon the spindl&wil1be first inserted-into slot 12,: and thatthe slightlrouhdedextemaledges ofthis slot aet,a's a leader;

guide for theend ofthe rolLinto this"slot and=intoslot 6;

Furthei*more, ,it will 'be seen -from Figs. 2 and 3 that the lengthofthe bent-ofi' edgeS 8,

8 is g'reater than the length of the internal slot 12. By suitablydetemining theamoMfi-of operation the spindle is set, the ends 13 beingpressdoutwardly as indicated in Figa 4; 7 This serves to'draw up.

dises jare, fiXed on the It will be evident that andthat the pa1allelsides of the slot.aet td 1 gu1de the end of the roll through the spindle*the" adjacent edges of the strip inturned to fonm an internallongitudinal slot, eharacteri'zed'intbat the inturned edges extendaxially -beyond the slot, but not up to theends of the spihdle.

2. A metallicspool spindle for photographie film sp0ols comprising atube.formed of sheet metal rolled 11p0n itself to provide a split tube,the longitudinal edges of said sheet metalbeifig cut-away at the cornersthereof,

and th'eportionsof said longitudinal edges intermediate of said cut-awayportions being insetin parallel lines to form widened side walls of anormally open paper strip receiving:slot, said she6t' metal being alsoformed with a slot substantiallparallel to the first slotlocatedin anopposite side of said split.

tube; v r v r 3. A spindle:fotphotographie film sp0ols eomprisinga-blahk of sheet metal rolled upon itelft provide a 'splittube, thelongitudinal edgs of saidxblank being cut-away at their corners andfofmed with inWardly projecting reenf0rcig flangszspaced apart toprovide a normally oPened strip receiving slot, the, cutawy-cornerportions of said split tube outw'ardl (if: said -flmiges formingabutting edgs ,to prvent: the closing of said slot, the ends:of saidtublar spindle bein'g eonnectible t0 spool dises.-

' THOMAS GEORGE BAXENDEN.

. JOHN ROBERT COLLYEAR.

